I don't think the sti grips will be compatible, the frame was completely designed by us (obviously its a 1911 frame so we didn't re-invent it, but you all know what we mean lol) so we designed the grips to go with it. And as for aluminum grips, they may come down the road, but for now we are going with a polymer grip

my commitment was based on it being an STI-clone and being able to use a standard STI grip. continued presence in any GB would be determined by cost of the grips, and what the delivery time of the grips would be.